Nutrition is all about NUTRITION ! protein fats minerals and vitamins...and since plants have all those and are the SOURCE of those that get processed into flesh...there is NOTHING in flesh but extras additives like antibiotics and crap that is not in plants !

Here is one...that is sufficient and authoritative scientific support of vegan diets for cats and dogs. 2016.

"Both cats and dogs may thrive on vegetarian diets, but these must be nutritionally complete and reasonably balanced. Owners should also regularly monitor urinary acidity, and should correct urinary alkalinisation through appropriate dietary additives, if necessary."

"a significant and growing body of population studies and case reports have indicated that cats and dogs maintained on vegetarian diets may be healthy—including those exercising at the highest levels—and, indeed, may experience a range of health benefits."

one good study example..." Study by Brown et al. (2009) It is difficult to envision any companion animals placed under greater physical demands than sprint-racing Siberian Huskies. During sprint races, these dogs run fast through snow, while hauling sleds, for much of the 30-mile race duration . In 2009, Brown and colleagues reported the results of a study of 12 sprint-racing Siberian Huskies fed either a commercial diet recommended for active dogs (n = 6), or a meat-free diet formulated to the same nutrient specifications (n = 6). The commercial diet contained 43% poultry meal, which was replaced by maize gluten and soybean meal in the meat-free diet. The dogs were fed these diets for 16 weeks, which included 10 weeks of competitive racing. Health checks were conducted by a veterinarian blinded to the dietary regimens. All dogs were assessed as being in excellent physical condition, and none developed anaemia or other detectable health problems."

Plenty real life examples of dogs and cats living healthy full lives on vegan diets too Bramble famous welsh border collie lived 25 years...Little Tyke a Lioness lived 9 years died of pneumonia in USA an ex zoo lioness who chose to not eat meat. QED it is indisputable that dogs, cats, humans, ferrets etc can thrive on nutritionally complete vegan diets. It is all about nutrition. There is no reason that ALL animals cannot thrive on vegan nutrition.

What is currently available out there December 2017 ? 6 main 100 percent vegan companies producing vegan petfoods. Major non vegan producers also producing vegan options for sick dogs such as Royal Canin, Halo etc.

Most major Non Vegan Petood suppliers also do Vegan option...this is usually called the "hypoallergenic" petfood for sick dogs and costs much more than the 80 percent veggies based standard non vegan kibble where the 20 percent animal content caused the ill health issue due to diet in the first place. Due to wishing to support 100 percent vegan companies those are not listed.

What are the current options for feeding Cats Dogs Puppies and Kittens Vegan petfood ? December 2017...updated feb 2018

Vegan Brands of Cat and Dog Foods Simple Product List According to Category of Companion Animal. https://www.compassioncircle.com/ does ALL lifestages for HOME MADE with RECIPES. Adult and Young Dogs and Cats.

Studies from 1971-82 indicated that 90-97% of all uroliths are struvite, a calculus composed of magnesium and ammonium phosphate bonded with water. By 1986 this figure had dropped to 82%, primarily because of more acidic diets containing less magnesium.
The most common culprits leading to feline urinary blockages are:

they were reported as being hostile and inadequate for vegan nutrition tests...https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5035952/ "In one case (Wysong), the company admitted that its product was unlikely to be nutritionally complete: “Wysong does not advocate the singular feeding of VeganTM to carnivores such as dogs and cats. … It is designed for intermittent feeding or as a base to add different meats for sensitivities and allergies”. They further asserted their philosophical opposition to the concept of attempting to produce a single, nutritionally complete diet: “Complete knowledge of nutrition does not exist … and therefore “completeness” is misleading. … With that in mind, Wysong seeks to formulate and educate for optimal, not “adequate” nutrition and encourages pet owners to rotate, vary, and enhance the diet”."

Vegan Pet
+61-(0)3-5942-7461
Suppliers in several Australian states and New Zealand
Manufacturer and supplier of "nutritionally complete and balanced" dry vegan cat and dog food formulated from 'natural ingredients, with the exception of synthetically produced taurine, niacin and some vitamins.'

VegePooch
Sydney
An independent AU-based supplier of vegan and vegetarian foods. Offer many varieties of dog and cat food, snacks and chews, such as Pegetables, Dr Chew, Burp stik.

V-dog
+1-888-280-8364
Sacramento, CA, US
"Crunchy [dog] nuggets using only natural, healthy and wholesome ingredients and without the use of artificial colors or preservatives... approved by The Vegetarian Society... developed without the use of animal testing."

There are more that produce Vegan petfood..most major Petfood suppliers like Royal Canin have vegan products for the dogs/cats who get sick on the animal content kibbles etc. Seems clear when dogs etc get kidney and allergy health problems...the solution is not flesh but more plant nutrition elements. Halo and Yarrah are other brands doing Vegan petfood but not 100 percent vegan companies as they produce non vegan petfoods also.

KITTENS...Commercial kitten vegan food only available from EVOLUTION in the USA. NOT available in Europe as at 2017...ONLY SOLUTION FOR KITTENS IS THEREFORE TO do HOME MADE food with VEGEKIT supplement. https://www.compassioncircle.com/vegepet/vegekit/

http://vegan-information.com/vegan_...otein_fat_minerals_percentages_and_names.docx list of dec 2017 available vegan petfoods and utritional content analysis. This has pictures o ALL the known 100 percent vegan company petfoods available as at end of 2017 in the world. The main 5 main vegan petfood suppliers. It has the NUTRITIONAL DETAILS OF CONTENT of PROTEIN FATS AND VITAMINS and MINERALS CONTENTS as well as the SOURCE of the protein and main ingredient be it Potatoes, Maize, Rice, Soy (human grade) Wheat (rare) Grain Free.

PRICES also as at end of 2017 excluding postage.

Feeding Commercial kibble per large dog per month 25 GBP/EUR/USD including postage costs.

Feeding home made, plus supplements of vegedog/vegecat/vegepup/vegekit per large dog per month 12 GBP/EUR/USD per month.

Postage of local distributors tends to be approximately 6GBP/EUR/USD per 15kg for the largest pack of kibble and supplements that last 2 months for a medium sized active dog.

Supplements cost for say 1KG of yeast about 10 GBP/USD/EUR and last several months or 1 dog or cat. Vegedpg/vegepup/vegecat/vegekit small bottles of powder supplements also cost similar. 10 USD/EUR.GBP cost per month per large dog of supplements.

Due to weight and cost efficiencies...it is sensible to order a small bulk supply of minimum 2 packs to 30kg the limit for the GBP/EUR/USD postage standard cost. Delivery is usually within 2 days.

The postage costs of international orders, not local on ebay or elsewhere, can mean ordering from abroad increases the transport / shipping costs to approximately the same as the cost of the items bought. I ordered 6 months supplies of supplements for 2 large dogs and 1 kitten and the items cost me 132 GBP/EUR/USD plus postage/shipping costs of 70 GBP/USD/EUR approximately to give an idea as I am in the UK(Europe before Brexit extra costs) importing from the USA. I may find these items on ebay locally in future or find a cheaper way or buying. It is still not too expensive or home made cheaper than commercial vegan petfood. 10 GBP/EUR/USD per animal per month costs even at that high postage/shipping cost.

When ordering BULK KIBBLE commercial petfood...inform the supplier this is bulk buy to ensure the batch expiry life of average 8 months for most kibbles is ensured and not old batch stock shipped out. Calculate the cost effectiveness of the shipping/postage costs also. I found ordering 2 packs of 15kg at a time the most cost effective for UK local supplies. This will vary depending on where ordered from of course.